I’ve long suspected this was going to be the tactic against him. Frustrate him at every turn. Use the political process to tie him up in knots and thwart the will of the people.
We have to pound the GOP and let them know that we know what they’re up to, and if they persist, we will exact our revenge from them in 2018.
Define "revenge".
If by that you mean Primary the bastards, great! But good luck. It's extremely difficult to unseat an incumbent (not saying it's impossible).
If he/she doesn't get primaried, then what are you going to do? Personally, I have no qualms voting against the Vichy Republican SOBs - but you'll get the usual screaming bleats from the Stockholm Syndrome GOP sycophants if you try advocating that route. Get rid of one or two or three of them and the tightened sphincters of the remnant will cause a sea change in their attitudes.